Climax of Blarde Runner

I didn't read the climax Blade Runner. The only thing I know is about the new nexus 7 brain and human cloning. I personally don't believe that the clones would replace humans and the clones only lived up to four years. Even if clones or android do take over the human race, it is almost always foreseen that something dramatic would happen to the human species after a post apocalyptic world. Human errors always some how leads to their doom.